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Jurors were told there were similarities between the cases of Caroline Devlin (left) and Susan Nicholson

Ms Nicholson’s parents, Elizabeth and Peter Skelton, spent six years and more than £10,000 trying to convince the police to reopen their investigation into their daughter’s killing.

They claimed they had been “ignored” and “failed” by police and every public body tasked with holding the force to account.

Mrs Skelton, 81, said: “Finally, we feel like we are being taken seriously.

“The more you look back at it all, the more furious you feel about how it was handled.”

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Media captionThe parents of one of two women killed by Robert Trigg speak out

Mr Skelton, 83, said: “This confirms what we knew all along. They can’t just say this was a mistake.

“We have been going on about this for six years. The evidence was pointing to this the whole time.”

At least two police officers were involved in the investigations into both killings, but the similarities between the cases were not regarded as suspicious. In both cases police treated Trigg like a bereaved partner rather than a suspect.

Sussex Police investigated its own officers three times but found nothing wrong with their handling of Ms Nicholson’s murder.

‘Truly sorry’

A spokesman for the force said: “Thames Valley Police have completed an independent review of the investigations. The review refers to potential missed opportunities and we have therefore referred it to the IOPC.

“We are truly sorry it took so long to get justice, and it is important we learn any lessons and provide answers for the families.”

The chairman of a separate inquiry, set up in October and led by the Safer West Sussex Partnership, will examine which services came into contact with Trigg and his victims and what they did to “manage any risks identified”.

A draft report is expected in the summer but is not likely to be published until the end of the year.